can refine
Regular verb: refine - refined- refined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can refine
you can refine
she can refine
we can refine
you can refine
they can refine 	I can be refining
you can be refining
she can be refining
we can be refining
you can be refining
they can be refining	I can have refined
you can have refined
she can have refined
we can have refined
you can have refined
they can have refined	I can have been refining
you can have been refining
she can have been refining
we can have been refining
you can have been refining
they can have been refining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't refine
you can't refine
she can't refine
we can't refine
you can't refine
they can't refine 	I can't be refining
you can't be refining
she can't be refining
we can't be refining
you can't be refining
they can't be refining	I can't have refined
you can't have refined
she can't have refined
we can't have refined
you can't have refined
they can't have refined	I can't have been refining
you can't have been refining
she can't have been refining
we can't have been refining
you can't have been refining
they can't have been refining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I refine?
can you refine?
can she refine?
can we refine?
can you refine?
can they refine? 	can I be refining?
can you be refining?
can she be refining?
can we be refining?
can you be refining?
can they be refining? 	can I have refined?
can you have refined?
can she have refined?
can we have refined?
can you have refined?
can they have refined? 	can I have been refining?
can you have been refining?
can she have been refining?
can we have been refining?
can you have been refining?
can they have been refining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I refine?
can't you refine?
can't she refine?
can't we refine?
can't you refine?
can't they refine? 	can't I be refining?
can't you be refining?
can't she be refining?
can't we be refining?
can't you be refining?
can't they be refining? 	can't I have refined?
can't you have refined?
can't she have refined?
can't we have refined?
can't you have refined?
can't they have refined? 	can't I have been refining?
can't you have been refining?
can't she have been refining?
can't we have been refining?
can't you have been refining?
can't they have been refining?